LM1972 Micro-Pot 2-Channel 78 dB Audio Attenuator with Mute | TIJ.co.jp

LM1972 (供給中)

Micro-Pot 2-Channel 78 dB Audio Attenuator with Mute



The LM1972 is a digitally controlled 2-channel 78dB audio attenuator fabricated on a CMOS process. Each channel has attenuation steps of 0.5dB from 0dB–47.5dB, 1.0dB steps from 48dB–78dB, with a mute function attenuating 104dB. Its logarithmic attenuation curve can be customized through software to fit the desired application.

The performance of a μPot is demonstrated through its excellent Signal-to-Noise Ratio, extremely low (THD+N), and high channel separation. Each μPot contains a mute function that disconnects the input signal from the output, providing a minimum attenuation of 96dB. Transitions between any attenuation settings are pop free.

The LM1972's 3-wire serial digital interface is TTL and CMOS compatible; receiving data that selects a channel and the desired attenuation level. The Data-Out pin of the LM1972 allows multiple μPots to be daisy-chained together, reducing the number of enable and data lines to be routed for a given application.

Key Specifications

Total Harmonic Distortion + Noise:

0.003% (max)

Frequency response:

100 kHz (−3dB) (min)

Attenuation range (excluding mute):

78dB (typ)

Differential attenuation:

±0.25dB (max)

Signal-to-noise ratio (ref. 4 Vrms):

110dB (min)

Channel separation:

100dB (min)


  • 3-wire serial interface
  • Daisy-chain capability
  • 104dB mute attenuation
  • Pop and click free attenuation changes

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    機能一覧 他の製品と比較 ボリューム制御 IC

    Number of channels (#)
    Power supply (V)
    Gain & attenuation (dB)
    THD + N @ 1 kHz (%)
    Interchannel crosstalk @ 1 kHz (dBFS)
    Dynamic range (dB)
    Operating temperature range (C)
    Package Group
    4.5 to 15    
    0dB to -78dB with 0.5dB steps    
    0 to 70    
    SOIC | 20